CS4237B Datasheet, PDF (66/114 Pages) Cirrus Logic – CrystalClear Advanced Audio System with 3D Sound

CS4237B
3D Space and Center (C2)
Default = 00000000
D7 D6 D5 D4 D3 D2 D1 D0
SPC3 SPC2 SPC1 SPC0 CTR3 CTR2 CTR1 CTR0
CTR3-CTR0
SRS processed "Center" gain term.
The least significant bit represents
1.5 dB attenuation, with 0000=0 dB.
See Table 24. When 3DM is on, this
value is forced to 0000.
SPC3-SPC0
SRS processed "Space" gain term.
The least significant bit represents
1.5 dB attenuation, with 0000=0 dB.
See Table 24. When 3DM is on, this
value is forced to 0010.
3DM
3DEN
3D Mono Enable. When set, the SRS
Mono-to-Stereo DSP is enabled.
(3DEN must also be enabled). This
allows a mono signal to be SRS
processed into a pseudo stereo im-
age.
3D Enable. Must be set to enable the
SRS 3D Sound DSP.
Consumer Serial Port Enable (C4)
Default = 0000xxxx
D7 D6 D5 D4 D3 D2 D1 D0
CSPE CSBR U
V
res res res res
V
The Validity bit in a sub-frame of
digital audio data.
3D Enable (C3)
Default = 000xxxxx
D7 D6 D5 D4 D3 D2 D1 D0
3DEN 3DM 3DSO res res res res res
res
Reserved. Must write 0. Could read
as 0 or 1.
3DSO
3D Serial Output. When set, SDOUT
data comes from the DAC inputs
which includes 3D effects. Typically
used when CSPE in C4 is set and
determines the data used on the
Consumer Serial Port output pin.
0 - The output is from the ADCs.
1 - The output is from the SRS DSP.
U
CSBR
CSPE
bit3
0
0
1
0
2
0
3
0
.
.
8
1
.
.
12
1
13
1
14
1
15
1
bit2
0
0
0
0
.
0
.
1
1
1
1
bit1
0
0
1
1
.
0
.
0
0
1
1
bit0
0
1
0
1
.
0
.
0
1
0
1
Space (SPC3-SPC0)
0.0 dB
-1.5 dB
-3.0 dB
-4.5 dB
-
-12.0 dB
-
-18.0 dB
-19.5 dB
-21.0 dB
-22.5 dB
The User bit in a sub-frame of digital
audio data.
Channel Status Block Reset. When
set, resets the channel status block
boundary.
Consumer Serial Port Enable. When
set, the serial port output format, on
SDOUT, converts to the consumer
standard for digital audio transmis-
sion, compatible with the consumer
portion of IEC-958. An older version
of the standard is also called
S/PDIF. Note that the serial port is
still enabled using the SPE bit in
WSS I16. For more information on
the consumer digital audio transmis-
sion format see Crystal’s Application
Note 22 titled Overview of Digital
Audio Interface Data Structures.
Center (CTR3-CTR0)
0.0 dB
-1.5 dB
-3.0 dB
-4.5 dB
-
-12.0 dB
-
-18.0 dB
-19.5 dB
-21.0 dB
-22.5 dB
Table 24. SRS 3D Sound Control
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